Construction of heterojunction photoelectrode via atomic layer deposition of Fe2O3 on Bi2WO6 for highly efficient photoelectrochemical sensing and degradation of tetracycline

被引:155
|
作者
Adhikari, Sangeeta [1 ]
Selvaraj, Seenivasan [1 ]
Kim, Do-Heyoung [1 ]
机构
[1] Chonnam Natl Univ, Sch Chem Engn, Gwangju 61186, South Korea
基金
新加坡国家研究基金会;
关键词
Heterojunction photoelectrode; Atomic layer deposition; Fe2O3-Bi2WO6; Photoelectrochemical; Sensing; PHOTOCATALYTIC DEGRADATION; SENSITIVE DETECTION; GRAPHENE OXIDE; PERFORMANCE; ANTIBIOTICS; FABRICATION; WATER; HETEROSTRUCTURE; ALPHA-FE2O3; COMPOSITES;
D O I
10.1016/j.apcatb.2018.11.043
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present paper describes the fabrication of a heterojunction photoelectrode by combining the wet chemical synthesis of Bi2WO6 with the formation of Fe2O3 layer by atomic layer deposition (ALD) technique. Fe2O3 with different atomic thicknesses was layered onto spin-coated Bi2WO6 nanoflakes by controlling the number of deposition cycles. The influence of the thickness of the Fe2O3 layers on photoelectrocatalytic detection and remediation was also studied. The deposition of a 15-nm layer of Fe2O3 on Bi2WO6 led to the best photoelectrochemical response under visible light activation. The performance of 15-nm Fe2O3 Bi2WO6 (4.3 mu A/cm(2)) was 3.6 times higher than that of pristine Bi2WO6 (1.2 mu A/cm(2)) at an external bias of 0.6 V. The enhanced performance was due to the increased spectral breadth of light absorption and efficient transfer of photogenerated charge carriers by the suppression of electron-hole pairs. The optimized photoelectrode detected tetracycline antibiotic in aqueous solution with a 0.3 mu M limit of detection and photoelectrocatalytically degraded around 95% tetracycline. The heterojunction photoelectrode structure prepared using ALD enables inexpensive, non enzymatic, amperometric determination and degradation of tetracycline in a stable and reproducible manner via a deduced mechanism. Our strategy can be used to fabricate photoelectrodes for a wide range of applications.
引用
收藏
页码:11 / 24
页数:14
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